It turns out he cut his hair because they start filming in just a few days on May 14! The IMDB page for Dunkirk has been updated and production is set to begin. HollywoodLife.com told you that we spoke to a source who said that Harry had “no choice” but to chop his hair off. “Harry had no choice but to cut his hair for his new movie role,” a source told us. “But Harry knows it’s all for a good cause, and cannot wait to get started on working on the film. He knows this is his first big break in Hollywood and he’s keen to do anything it takes to make it work, and that includes upsetting his scores of fans by cutting his hair.” Harry is making his big screen debut in Christopher Nolan‘s Dunkirk, set during World War II in the 1940s, so it makes sense he had to do away with his long hair. “Christopher Nolan is a stickler for detail,” a source told us. “And he did warn Harry that would be the case and he would have cut his locks if he got the role during the initial screening process.”